﻿using System;
using System.Collections.Generic;
using System.Text;

namespace MyPhotoIndex.Utilities
{
    public class OSUtils
    {
        private static string ms_osInfo;
        public static string GetOSInfo()
        {
            if (string.IsNullOrEmpty(ms_osInfo) == false)
            {
                return ms_osInfo;
            }

            //Get Operating system information.
            OperatingSystem os = Environment.OSVersion;
            //Get version information about the os.
            Version vs = os.Version;

            //Variable to hold our return value
            string operatingSystem = "";

            if (os.Platform == PlatformID.Win32Windows)
            {
                //This is a pre-NT version of Windows
                switch (vs.Minor)
                {
                    case 0:
                        operatingSystem = "95";
                        break;
                    case 10:
                        if (vs.Revision.ToString() == "2222A")
                            operatingSystem = "98SE";
                        else
                            operatingSystem = "98";
                        break;
                    case 90:
                        operatingSystem = "Me";
                        break;
                    default:
                        break;
                }
            }
            else if (os.Platform == PlatformID.Win32NT)
            {
                switch (vs.Major)
                {
                    case 3:
                        operatingSystem = "NT 3.51";
                        break;
                    case 4:
                        operatingSystem = "NT 4.0";
                        break;
                    case 5:
                        if (vs.Minor == 0)
                            operatingSystem = "2000";
                        else
                            operatingSystem = "XP";
                        break;
                    case 6:
                        if (vs.Minor == 0)
                            operatingSystem = "Vista";
                        else
                            operatingSystem = "7";
                        break;
                    default:
                        break;
                }
            }
            //Make sure we actually got something in our OS check
            //We don't want to just return " Service Pack 2" or " 32-bit"
            //That information is useless without the OS version.
            if (operatingSystem != "")
            {
                //Got something.  Let's prepend "Windows" and get more info.
                operatingSystem = "Windows " + operatingSystem;
                //See if there's a service pack installed.
                if (os.ServicePack != "")
                {
                    //Append it to the OS name.  i.e. "Windows XP Service Pack 3"
                    operatingSystem += " " + os.ServicePack;
                }
            }
            //Return the information we've gathered.
            ms_osInfo = operatingSystem;
            Logger.Log(operatingSystem);
            return operatingSystem;
        }
    }
}
